Creating and Improving Garden Beds
Guest post by Nathan Harman of the Bloomington Permaculture Guild.
Garden beds come in all shapes and forms. There’s no right or wrong. Your space, crops, tools and techniques all influence what sort of bed will work in your situation. A bed might be permanent or a single year’s area within the greater garden. It may be raised, sunk, tilled, mulched, or even portable. It’s bigger than a row, smaller than a garden. It should be a convenient size for what you do. (Garden bed photo at right courtesy of Kenny Point through a flickr creative commons license.)
First: your site. If it’s on much of a slope, lay your beds out on contour and provide water-sinking swales so they don’t erode away in the rain. You can use a bubble-level, an a-frame level or an approximation to figure your bed contours. Usually, laying beds east-west gives the most even sun throughout the season and day, but that will depend on your particular shade. If your garden is small, short raised beds may make sense. If it’s large, raised beds may be impractical, long rows and cultivation making more sense. Overly wet sites benefit from the increased drainage of raised beds, and heavy mulches help drier soils.
Next: soil texture and fertility. In dealing with hard, infertile soils you may choose to do a fair amount of soil disturbance and mixing to loosen, add organic matter and minerals. This might be through the use of shovels and forks, a roto-tiller or a series of tractor implements. Disturbance of this kind can be appropriate but should be used sparingly, both for labor’s sake and because turning the soil releases years of pent-up weed seeds while also damaging soil organisms and layers. One could instead put better topsoil, preferably with compost and manures, directly onto poor soils. While potentially expensive, this allows you to custom build the soil for your first beds while you start the slower work of improving the native soil. This technique is often seen in standalone, framed, raised beds in smaller scale gardens. (Raised bed photo courtesy of Jennifer Worthen through a flickr creative commons license.)
Better yet, create soil in place through lasagna gardening and heavy permanent mulch. This involves the successive placement over the existing soil of layers (lasagna-like) of cardboard/newspaper, manures, leaves, clippings, kitchen waste, native soil, compost, brush, mulch, minerals etc. Use whatever you have or can find cheap and easy that will compost into soil. A mat of cardboard over the existing sod or soil will smother it and provide the initial worm food. Then pile on high-nitrogen ingredients like animal manures, fresh lawn clippings or kitchen scraps. Next, come “browns” like leaves and straw. Repeat. Soil, compost and minerals to taste. Bake at usual composting temperatures. Into this thick rottable mat you can poke small holes to fill with good soil and set transplants for this year’s garden. By next year you should have great soil to work with. You can repeat smaller doses of the same treatment indefinitely, or move to other techniques once your soil is built up.
Another super-easy bed building technique is to simply place good quality HAY bales (not straw) where you’d like beds to be. Hay is green, sweet smelling animal food. Straw is yellow, dried waste from grain harvesting. Soak the hay bales well and let composting begin for a few weeks. After they’ve cooled a bit, poke small holes in them, place soil and transplants. Let grow. The first year, it’s great for tomatoes, peppers, cukes and the like. Next year you will have a loose, rich pile of black dirt in just the right place. Put four or more in a square with a place for a compost pile in the middle, and bingo… nice sized, no dig fertile garden plot.
No matter how you build your beds initially, you’ll find ways to improve them over time. You will need to keep up their fertility and keep down the weeds. Compost and mulch, friends. Mulch that becomes compost in place! BUT… keep in mind that heavy perennial mulches do provide great quarters for slugs, snails and a whole host of over-wintering pestilent buggies and their eggs. Mulch also keeps the soil cooler in the spring and makes direct seeding tricky because of the rough and shady seedbed. Thus, it can be helpful to occasionally remove and replace mulches for awhile in the spring.
Alternatively, in a tilled garden, make use of cover cropping to provide winter protection and growing season fertility. Note that depending on your bed spacing and bed heights it can be a sizeable effort to switch back and forth from tillage to perennial raised bed systems. It can certainly be done but they can also get along very well next to each other in the same garden plan. Okay then… get to bed. Happy gardening.
Nathan Harman is an active member of the Bloomington Permaculture Guild and participant in Transition Bloomington. He and his wife operate Dome-Grown, a small permaculture farm in Bloomington.

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